Testing Rational Choice Theory through Arizona's "Move Over Law"

States nationwide have implemented "Move Over Laws" to try and increase roadway safety, yet even with these laws, hundreds of people are killed each year while working in and roadways. In Arizona, the "Move Over Law" requires drivers approaching a stopped vehicle displaying flashing lights to "move over" or "slow down." However, not everyone complies with this enacted law, and the purpose of this study is to observe how approaching drivers behave when presented with various scenarios. Scenarios involved the use of different police car types (marked or unmarked), light displays (no lights, hazards, or emergency lights), and the advertisement of Arizona's "Move Over Law" (signboard or no signboard). Associated risk varied with each scenario, and according to rational choice theory, a driver's behavior should minimize risks and maximize benefits. Under the hypothesis that police presence impacts driving behavior, the expectation was that driver compliance through "moving over" and/or slowing down would be highest when a marked police car or emergency lights were used. Also hypothesized was that awareness impacts compliance with the thought that increasing awareness by using a signboard would increase "move over" percentages and decrease speeds. From the test site along State Highway 260 in Payson, Arizona, the results indicate that car type and light display impact driving behavior. The use of the marked car or emergency lights generally had higher adjusted compliance, higher "move over" percentages, and lower speeds than when the unmarked car or no lights were tested. Looking at how awareness influences behavior, the use of the signboard had a greater impact when the unmarked car was used as opposed to the marked car. Based on the results, both hypotheses were supported.